class Human:
    def eat(self):
        print("人类吃饭")
        
class zhhuman(Human):
    def eat(self):
        print("中国人用筷子吃饭")
class usahuman(Human):
    def eat(self):
        print("美国人用叉子吃饭")
def somone(somone:Human):
     somone.eat()      
        
老中 = zhhuman()
老美 = usahuman()
# 老中.eat()
# 老美.eat()
somone(老中)
somone(老美)